I think its difficult to separate what we find visually stimulating with "beauty or ugliness".
I find the look of a vagina visually stimulating, I especially love Mrs Sens how she keeps it shaven and it never fails to turn me on, but is it a "thing of beauty"? I don't think I can separate the viewpoint.
Watching Naked Attraction, there are quite the range of both, for vaginas, I guess the ones that are more like a peach / camel toe with just the line down the middle are more visually appealing than those with labia protruding, but then I have no emotional connection to them. I have no doubt that once you get intimate with one, they are all beautiful.
As for penises, being circumsised myself, I think cut looks better than uncut (Mrs Sen shivers at the site of the ones on Naked Attraction, calls them ant eaters) and has pity for my daughter as uncircumsised is far more common these days. Mrs Sen also comments she likes my package, tidy, shaven completely, balls don't sag and enough size.
For my own, I am happy most of the time with its look, I'd like to be more of a shower than a grower, but thats mostly for my own peace of mind.